Work Platform tool &amp; material shelf

ABSTRACT

This is an auxiliary Tool and Material Shelf device for a use on a work platform for mobile aerial lifts. Construction and maintenance workers use the device to safely organize and position their tools and materials on the work platform. The universal configuration permits use with various sized aerial lifts and the device supports heavier material and tool loads compared to other prior art. The tool and material shelf/support device includes various options such as various shelves and material supports to be suitable for the differing needs of the user. The main components are comprised of two universal “U” shaped interlock members that fit over the platform guard rails; a vertical structural support may be custom fitted or designed complete with an adjustable locking device; and the trays and/or material supports to hold the tools and materials.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Provisional Patent Application Ser. No. 60/506,213 filed Sep. 24, 2003 and 60/509,133 filed Oct. 6, 2003 by Douglas E Waymire of Anderson, Ind., U.S.A., and titled “TOOL AND MATERIAL SHELF (WITH REMOVABLE FEATURES) FOR MOBILE WORK PLATFORMS”.

FIELD OF INVENTION

The present invention relates generally to a Tool and Material Shelf that a construction, maintenance or other personnel may use to safely organize and position his tools and materials on a work platform for mobile aerial lifts and other assist devices. The Present Invention may be utilized either as a single shelf or material “hook” support or may be used with other shelves (fixed or removable) at the discretion and needs of the person. It includes various options to be suitable for the differing needs of the user.

The new shelf and material support device has features built-in to make its use both functional and simple to operate. The new device has various improvements that will be discussed below.

FEDERALLY SPONSORED RESEARCH

Not Applicable.

SEQUENCE LISTING OR PROGRAM

Not Applicable.

BACKGROUND

Field of Invention

The new shelf and material support device described in this specification is an auxiliary mechanism that is designed to easily and quickly install on a standard mobile aerial lift machine. This shelf and support augments the productivity of the user of the lift machine and improves the safety of the operation during use.

A. Introduction of the Problems Addressed

Mobile aerial lift machines are normally supplied without a tray or shelf that would be used for the purpose of holding material/tools. However, the skilled trade or maintenance person using the lift machine needs a tray or shelf to put his or her materials and/or tools upon while performing a job or task. Without a tray or shelf, the worker must lay the material and/or tools on the floor of the lift or create a makeshift device to hold the materials or tools. Workers have been known to rig and attach boxes and other supports to the lifts in order to hold their material/tools. These may be welded, bolted, or screwed to the railing of the lift. Although these boxes or supports are used, they are not commercially available.

B. Prior Art

Historically, the prior art devices were often used for ladders, scaffolds of limited mobility, or fixed tool benches. Often these were light gauge devices or devices designed for specific machines of one manufacturer. The new shelf and material support device addresses these limitations and provides a solution to the stated problems.

Examples of prior auxiliary mechanisms for material and tool organization begin with U.S. Pat. No. 3,252,614 issued to Evans (1966). This teaches a way to attach a material or tool bin over a thin band of a metal strap. The device is stated to be stackable for storage but does not teach any use with mobile lift machines. It implies use for manufacturing parts and the like. Another improvement for material and tool support was issued to Benolkin as a U.S. Pat. No. 3,998,416 (1976). It teaches a flexible strap with a key hole and button connection means. It is used only with a ladder and is limited in size and use, mainly as a means to hold a paint can and tools for painting. Although easily installed, this device adds no additional capacity for a large load of tools or materials as the present invention.

Other examples include a U.S. Pat. No. 4,480,810 issued to Hall (1984) which teaches a ladder caddy clamped to the rung of a ladder. It holds tools and materials, but does not have the large capacity of the new shelf device. A U.S. Pat. No. 4,462,243 issued to Richards (1984) teaches a specific, complex tool holder that is held in place by means of a button stud on one structure and a key hole aperture on the adjacent structure. The means to secure does not teach use on mobile platforms or general tool or material supports.

A U.S. Pat. No. 4,646,877 issued to Whan (1985) teaches an angle iron strut supporting a material holder on a scaffold. It does not show multiple type material and tool holding bins nor discuss use with a mobile aerial lift. It does not suggest the U-shaped interlock of the present invention. U.S. Pat. No. 4,715,474 was issued to Wehmeyer (1987) that teaches an interconnect system for round members of a scaffold. It teaches a clamping system for a restricted cross-section of support member and is not flexible and versatile like the present invention.

A support table for a scaffold is taught in U.S. Pat. No. 5,158,023 issued to Allen (1992). This device uses a U-interlock on the top rail and an angle strut to the floor of the platform. It does not teach general tool and/or material support or versatility for various cross-sections of guard rails. A U.S. Pat. No. 5,481,988 issued to Dess (1996) was focused at extension platforms for fork trucks and the like. It taught telescoping structures for the work platform and guard rails but does not teach tool or material support features.

The U.S. Pat. No. 5,878,838 issued to Lapp (1999) teaches a hook support for a scaffold guard rail and angle struts supporting the platform. It does not discuss using either to support tools or materials.

A tray or shelf for scissors lifts and aerial lift are taught in U.S. Pat. No. 6,095,057 issued to Corban (2000) and in publications on the internet at skycaddy.com for J. C. Engineering. This device is a stamped or cast device that is light gauge in nature for light loads of tools or materials. It teaches one retaining pin on only one guard rail which permits potential tipping of any loads. It requires special custom designs for the various cross-section and sizes of guard rails that vary from manufacturer to manufacturer. It only teaches trays that are under the guard rail plane which is not adequate for certain skilled trades. It does not teach material hooks for pie and conduit, or the like, nor inclined tables for wire distribution. The claims are very narrow and limited. The publication related to this patent is likewise limited in versatility. Each cross-section of guard rail requires a special design and lacks versatility and scope for the aerial lift industry.

Other prior art does not suggest or disclose the same features, capabilities, and improvements in combination of the present invention.

SUMMARY OF THE INVENTION

The new invention is a Tool and Material Shelf or Support system. The configuration permits use with various sized aerial lifts and supports heavier material and tool loads compared to other prior art. The device has several features built in that will be described below. These features permit the device to be light enough for one person to handle yet sturdy enough to take the weight and abuse in the work environment. It is designed and configured to permit a construction and maintenance worker to safely organize and transport his tools and materials when using a mobile aerial lift device and its work platform.

The main components of this invention are comprised of two universal “U” shaped interlock members that fit over the platform guard rails; a vertical telescoping structural support posts may be custom fitted or designed complete with an adjustable locking device; and various trays, material supports and/or container devices (all of which may be fixed or removable) to hold the tools and materials. The preferred embodiment and alternative embodiments are shown is the accompanying drawings and pictures.

The materials comprising the new shelf and material support device are standard and available from many sources. The materials for the various trays and accessories are primarily the same as utilized in standard tool holders and material containers commonly used for work at ground level. The interlock members may be different types of sheet, structural, cast or molded materials as discussed below. The vertical support posts can be various types of materials configured in a tubular cross section that permits telescoping for length adjustments while maintaining the strength of a closed structural member. This is discussed further, below. One skilled in the art can appreciate that many variation of materials and configurations for the tool and material support may be used to permit the scope and spirit of this invention as described below and as depicted in the accompanying drawings.

OBJECTS AND ADVANTAGES

Accordingly, there are several objects and advantages of the new shelf and material support device described in this specification. There currently exist some mechanisms for ladders and scaffolds and devices that are made specifically for one type of aerial lift. This new shelf and material support device provides an improvement because it is designed to be used with a wide variety of the most common aerial lift with various trays and bins for materials and tools in commercial and industrial settings.

One advantage of this device over others in the field is that it is universally adaptable to different sizes and shapes of mobile aerial lift machines. The adjustable vertical support posts and the safety locking pins provide a secure attachment to the various sized work platforms. While an alternative embodiment may be custom built to an exact dimensioned platform, the preferred embodiment crosses virtually all makes and models of machines. This results in less proliferation to fit most machines and eliminates the need to buy specially designed units for only one type of lift machine.

Another advantage is its versatility. The basic unit may be adapted with different trays and material containment options to permit the different needs of the trades person in construction and maintenance. The design is configured to be adaptable for differing materials and tools. In addition, the trays may be attached and fixed directly to the U-shaped members or, as an alternative embodiment, they may be attached by means of a removable connection system so various trays may be readily interchanged.

Another advantage is its simple and inexpensive design. Because it uses the same materials as other equipment and tools systems in the construction and maintenance industry, a manufacturer may leverage his material-buying power with a higher volume. Also, the processes to manufacture all the parts for the invention are well known in the industry.

A further advantage is its support of safety in the workplace. The device permits the materials and tools to be well organized and contained. The work surface where the tradesman stands will be free of materials and tools and permit him to safely support himself by not standing or tripping on misplaced objects. Likewise, the containment of the objects will lessen the chance for the objects to be unknowingly kicked or bumped to passers-by, below.

An important advantage is the added strength of a device with this configuration. The dual interlocks, the additional safety lock pins, and the vertical support posts are designed to jointly provide a much stronger support system that is on the market, today.

Another advantage is the device improves ergonomics and accessibility. The invention permits a tradesman easier access to the tools and materials. Most will now be at waist level and within arms length. Importantly, the need to stoop down and remove ones eyes from the work is also reduced significantly.

Another advantage is that the reduced bending and reaching saves time. More of a person's time is used in doing the skilled task rather than retrieving or moving materials and tools during the operation. Hence, the improved efficiency saves the worker effort and increases the productivity of the operation.

Finally, other advantages and additional features of the present invention will be more apparent from the accompanying drawings and from the full description of the invention. For one skilled in the art of tool and material placement for work platforms, such as described here, it is readily understood that the features shown in the examples with this invention are readily adapted to other types of similar devices in the industry.

DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the present invention that is preferred. The drawings together with the summary description given above and a detailed description given below serve to explain the principles of the invention. It is understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown.

FIG. 1 is a PERSPECTIVE View of the preferred embodiment of the adjustable support for the Tool and Material shelf for mobile work platforms.

FIG. 2 is a series of perspective views of various types of lift machines with which the Tool and Material shelf is utilized.

FIG. 3 shows a Sketch of a typical WORK PLATFORM on a Lift machine.

FIG. 4 shows a variety of typical Guard Rail cross sections used with Work Platforms.

FIG. 5 shows a series of drawings from different views that help demonstrate the tool and material shelf in a Universal (Flexible) Embodiment.

FIG. 6 shows details of an example of a locking device for the UNIVERSAL EMBODIMENT.

FIG. 7 shows an isometric assembly of the tool and material shelf in a Universal (Flexible) Embodiment.

FIG. 8 shows details of an example of a tray utilized with the tool and material shelf in a Universal (Flexible) Embodiment.

FIG. 9 shows details of various examples of types of top trays that may be utilized with the tool and material shelf in a Universal (Flexible) Embodiment.

FIG. 10 shows details of examples of types of material holding devices that may be utilized with the tool and material shelf in a Universal (Flexible) Embodiment.

FIG. 11 shows material holding devices similar to FIG. 10 on a Custom-made, fixed device as an Alternative Embodiment.

FIG. 12 shows material holding device similar to FIGS. 10 and 11 on a Pinned device as an Alternative Embodiment.

FIG. 13 shows an Alternative Embodiment for attaching the trays in a removable manner.

FIG. 14 shows the Alternative Embodiment in FIG. 13 used with various examples of different trays.

DESCRIPTION OF THE DRAWINGS—REFERENCE NUMERALS

The following list refers to the drawings:

-   21 universal, flexible embodiments -   22 top/higher U-interlock member -   23 bottom/lower U-interlock member -   24 higher vertical structural support post -   24 a lower vertical structural support post -   25 material hook (optional) -   26 generally the adjustable locking device -   27 pin aperture -   28 lock pins and cotter keys -   29 threaded fastener -   30 tee nut for slot -   31 end nut -   32 elongated apertures (slots) -   33 hand wheel/knob -   34 flat tray -   35 support gussets -   35 a support gussets -   36 inclined tray -   37 posts -   38 deep tray for material and/or tools -   39 tool box -   40 divided container -   41 adjustable single material support -   42 adjustable double material support system -   43 fixed single material support -   44 fixed double material support -   45 pinned material support -   46 removable connection system/means -   47 vertical base angle gusset with button connector -   47 a horizontal base angle gusset with button connector -   48 button studs -   49 shelf gussets -   50 key slots -   51 tray position indicator line -   226 scissors lift machine -   227 articulated lift machine -   228 lift machine with boom basket -   312 general work platform -   413 work platform guard rails.

DETAILED DESCRIPTION OF PERFERRED EMBODIMENT

The present invention is a tool and material shelf and support system for mobile aerial lift machines. The main components of this invention are comprised of two universal “U” shaped interlock members that fit over the platform guard rails; a vertical structural support posts may be custom fitted or designed complete with an adjustable locking device; and various trays, material supports and/or container devices (all of which may be fixed or removable) to hold the tools and materials.

The materials comprising the device are standard and available from many sources. The two universal “U” shaped interlock members can be made from various types of sheet product. The gauges can vary from three eighths inch (⅜), quarter inch (¼), one eighth inch (⅛), 10 gauge, or the like of various steels and other metals that may be readily formed into the “U Shaped” configuration. In addition, structural or cast plates may be used if needing high strengths for very heavy material supports (such as heavy pipe and the like). Finally, fiberglass and other various plastics or compound materials may be molded into the shape as long as appropriate testing has insured enough strength for the application.

The vertical structural support posts can likewise be comprised of various metals, plastics and the like. The preferred embodiment shows a closed tubular member. One skilled in the art understands that the tube may be square, rectangular, circular or the like. One skilled also knows that other structural cross sections may be used as long as the compressive strength is maintained and the universally adjustable length connector shown in the drawings is properly fitted to a different configuration.

The various trays and material support components are made of light gauge metals, plastics and the like. The material “hooks” may require tubular or structural members of heavier gauged metals and composite materials.

The entire device is fastened together by welding, bolting, riveting or the like. Threaded fasteners seem the best for the locking device but one skilled in the art appreciates other means to accomplish the spirit of this invention. Simple pins and cotter keys, or the like, may be used to attach the U members to the lift guard rails. Obviously, metal sheet members may be bent and formed by a power press or brake. Plastics and composite alternatives would be molded or cast to the proper configuration. Depending on the materials used, secondary drilling operations may be required for some of the design configuration such as the lock pin apertures, etc.

A person having ordinary skill in the field of this invention appreciates the various materials and component parts that may be used to physically permit this invention to be produced and utilized. The improvements over the existing art are providing a device that:

-   -   is universally adapted for the various makes and models of         mobile aerial lift machines;     -   is versatile;     -   is a simple and inexpensive design;     -   supports safety in the workplace;     -   is stronger than other designs;     -   supports ergonomics and accessibility; and, saves time and         increases productivity.

In the drawings and illustrations, note well that the FIGS. 1-14 demonstrate the general condition of a tool and material shelf and support for mobile aerial lift machines. The manner of the device described is functionally understood by those skilled in the art to be appropriate for tool and material support. One skilled in the art readily appreciates that tool and material devices shown here are exemplary and not limiting in their nature.

FIG. 1 is a PERSPECTIVE View of the preferred embodiment of the adjustable support for the Tool and Material shelf for mobile work platforms. This is the Universal (flexible) embodiment 21 that may adjust to various lifts and work platforms from various manufacturers.

FIG. 2 is a series of perspective views of various types of lift machines with which the Tool and Material shelf is utilized. FIG. 2A is a PERSPECTIVE View of a mobile aerial lift machine that is commonly called a scissors lift 226. Next, shown as FIG. 2B is another mobile aerial lift machine, an articulated lift 227. In FIG. 2C an articulated lift machine is combined with a boom basket 228. All three pictures are to demonstrate the wide variation of work platforms and the need for a universal shelf device as the Present invention.

FIG. 3 shows a sketch of a typical work platform 312. Note that the width w and the height h vary between manufactures, between types of lifts, and between specific sizes or models.

FIG. 4 shows a variety of typical Guard Rail cross sections 413 used with a Work Platform 312. FIG. 4A shows a typical, nearly square small tube with a height “a” and a width “d”. FIG. 4B shows a larger rectangular tube with a height “c” and a width “e”. FIG. 4C shows a structural member, here an angle iron, with a height “c” and a width “f”. The final example in FIG. 4D is an elliptical tube, here a circle, with a height “c” and a width “g”. Note there is a plethora of cross sections in the work environment, hence the need for a universal device such as the present invention.

FIG. 5 shows a series of drawings from different views that help demonstrate the tool and material shelf in a Universal (Flexible) Embodiment 21.

FIG. 5A shows an Isometric of the tool and material shelf in a Universal (Flexible) Embodiment 21. The top universal PICTURE of an “U” shaped interlock member 22 and the bottom “U” shaped interlock member 23 both have pin apertures 27 for the locking pins 28 (described below). Each member 22 and 23 are fastened by some means such as welding, rivets, threaded fasteners or the like to the vertical structural support posts 24 and 24 a. The two posts 24 and 24 a “telescope” into each other (one support slides within the other) and the two supports 24 and 24 a are held in place by the adjustable locking device 26. The material “hook” portion 25 of the vertical support post is optional.

FIG. 5B shows the Front view of the invention 21. The two interlock members 22 and 23 are fastened to the vertical structural support posts 24 and 24 a. The supports are held rigid by the adjustable locking device 26.

FIG. 5C shows a top view of the UNIVERSAL EMBODIMENT 21 with the same parts, including the material hook 25.

FIG. 5D provides a side view with the UNIVERSAL EMBODIMENT 21 being placed over the lift platform guard rails 413 and held by the lock pins and cotter key 28, or the like.

FIG. 6 shows details of an example of a locking device 26 for the UNIVERSAL EMBODIMENT 21.

FIG. 6A shows a front view of the locking device 26 juxtaposed on the vertical support posts 24 and 24 a. Here the threaded fastener 29 (with a hand knob) is fitted through aperture 32 in the vertical support posts 24 and 24 a. The clamping is accomplished by means of a “tee” nut fastener 30 and an end nut 31. FIG. 6B is a section demonstrating the apertures 32. FIG. 6C is an exploded view of the “tee” nut fastener 30. FIG. 6D is a side view showing the fastener 29 and the hand knob 33 engaged with the vertical support posts 24 and 24 a.

FIG. 7 shows an isometric assembly of the tool and material shelf in a Universal (Flexible) Embodiment 21. The various elements are indicated and have been described above.

FIG. 8 shows details of an example of a tray 34 utilized with the tool and material shelf in a Universal (Flexible) Embodiment 21. FIG. 8A shows a drawing of a flat tray 34. The tray 34 is supported by two gussets 35 which are attached by a fastening means, such as welding, to the top universal “U” shaped interlock member 22. The remaining parts shown have already been described, above.

FIG. 8B is a top view of the flat tray 34 with the hidden gussets 35. FIG. 8C shows the front view if the entire tray system. FIG. 8D shows the side view of the entire tray system. Note the presence of the gussets 35 does not preclude the use of the optional material “hook” 25. However, the presence of the gussets provides substantial strength over prior art designs. In this side view, the guardrail 413 of the work platform is also shown as well as the securing pins and cotter keys 28.

FIG. 9 shows details of various examples of types of top trays (numbered below) that may be utilized with the tool and material shelf in a Universal (Flexible) Embodiment 21.

FIGS. 9A through 9E repeats the description in FIG. 8 of the flat tray 34 for reference. FIGS. 9F, 9G, 9H, 91 and 9J show a different type of material support. Here, the tray 36 is somewhat inclined. Fastened to the tray 36 is a plurality of posts 37 (the example here is six 6). The material posts 37 may be welded, bolted, or the like to the inclined tray 36. Once in place, the posts 37 may support various types of materials, such, as but not limited to, wire spools and the like.

FIG. 9J includes the side view of the inclined tray 36 and the posts 37. Note also the gusset 35 a may be somewhat different from the gusset 35 used with the flat tray 34 described above to account for the inclined tray 36 configuration. The interlock member 22 and the pin and cotter key 28 are still connected over the guardrail 413.

FIG. 9K shows a deeper material or tool tray 38. FIG. 9L shows a larger “tool box” 39 that may be used. FIG. 9M shows a divided container 40 that may be provided for separation of several materials on the work platform.

FIG. 10 shows details of examples of types of material holding devices 41 and 25 that may be utilized with the tool and material shelf in a Universal (Flexible) Embodiment 21. FIG. 10A shows a sketch of the invention with one material holder 41. FIG. 10B shows a double holder system 42 that includes a material holder 25 on the higher interconnect 22 and a material holder 41 on the lower interconnect 23.

FIG. 11 shows material holding devices 43 and 44 similar to the one in FIG. 10 on a Custom-made, fixed device as an Alternative Embodiment. FIG. 11A shows a sketch of the invention with one single material holder 43. FIG. 11B shows a double holder 44. One skilled in the art realizes a plurality of holders of various shapes and sizes is possible. One also notes the major difference here is that the main body has been custom fitted to a specific guardrail and does not incorporate the Universal (Flexible) Feature described in the Preferred Embodiment, above.

FIG. 12 shows material holding device 45 similar to the ones in FIGS. 10 and 11. Here the connection is strictly a Pinned device as an Alternative Embodiment 45 and incorporates the fastening of the vertical support post 24 utilizing multiple lock pins and cotter keys 28. This is not the preferred way since this embodiment limits some of the vertical flexibility and adjustability of the device. It may be quicker to set-up with a custom-made lift machine and may be appropriate for some specific applications.

FIG. 13 shows a secure Alternative Embodiment for attaching the trays in a quickly removable manner. This is an assembly sketch similar to the one in FIG. 8, above, and includes the Isometric view FIG. 13A; Top view FIG. 13B; Front view (above rail line 51) FIG. 13C; the Side view (of above rail line 51) FIG. 13D; the Front view (below rail line 51) FIG. 13E; and the Side view (below rail line 51) FIG. 13F.

In this Alternative Embodiment the attachment of trays, such as the flat tray 34 or inclined tray 36 (or others such as shown above) is by means of a removable connection system 46 as shown in FIG. 13H and other accompanying drawings. The U-interlock member 22 has a plurality of angle gussets 47 [shown here as an example of two (2)] that are permanently attached to the member 22 by means of welding, riveting, or the like. If the member 22 is made of a cast or molded material, the angle gusset 47 could be similarly cast or molded integrally to the member 22 or could be fastened as a secondary operation to member 22 by threaded fasteners, pins, rivets, adhesives, friction welds or other heat processes. Integrally fastened to each angle gusset 47 are two “button” studs 48. These studs 48 may also be integrally cast or molded to the angle gusset 47 if the angle gusset 47 is similarly manufactured or attached by a secondary operation. The button studs 48 may be of various shapes as long as the expanded “top” portion is larger than the key slots 50 discussed below.

Each of the trays such as the flat tray 34, the inclined tray 36 or the like has a plurality of gussets 49 and 49 a [shown here as an example of two (2)] similarly attached to the tray 34 or inclined tray 36, or the like. These gussets 49 and 49 a have two key slots 50 that are apertures through the tray gussets 49. The whole assembly is shown in side views FIGS. 13D and 13F. The individual parts that make up the removable system are shown in FIGS. 13G and 13H. Note that in FIG. 13G, the gussets 49 a extend further horizontally under the flat tray 34 and in FIG. 13H the gussets 49 extend further vertically along member 22. As one skilled in the art appreciates, either system may be designed to carry the weight of the flat tray 34 and its contents. FIG. 13H is more compact to the rail system and is the preferred removable system 46.

In FIGS. 13E and F, the alternative is shown for positioning the flat tray 34 at or below the top (shown by line 51) of member 22. This may be desirable for some trades to keep the guard rail 413 free of any material.

FIG. 14 shows the Alternative Embodiment in FIG. 13 used with various examples of different trays. In this series of views, the trays 34 and 36, material bins 38 and 40, and tool boxes 38 and 39 shown above in FIGS. 8 and 9 permanently attached to member 22 are now depicted with the removable fastening system 46. As one well skilled in the art appreciates, all the trays, bins, tool boxes and the like are shown as examples of typical tool and material holding devices.

In total, all the points and details mentioned here throughout this detailed description of the drawings are exemplary and not limiting. Other components specific to describing a tool and material shelf or support device may be added as a person having ordinary skill in the field of this invention well appreciates. The drawing and components have been focused on the parts shown in respect to the present invention.

OPERATION OF THE PREFERRED EMBODIMENT

The tool and material shelf as the universal, flexible embodiment 21 has been described above. The manner of how the embodiment 21 operates is described below. Note well that the description above and the operation described here must be taken together to fully illustrate the concept of the present invention.

The embodiment described above is a tool and material shelf or support device 21, for use with a mobile aerial lift machine. The device 21 is simply fitted over the work platform guardrails 413 of the mobile aerial machine. As described in the preferred embodiment. The vertical support post 24 and 24 a are adjustably connected in length. The members 24 and 24 a telescope within themselves and are set to the appropriate size for the specific machine. (See FIGS. 2, 3, and 4 to recall the variation in the industry.) Then, supports 24 and 24 a are rigidly fastened and held in place by the adjustable locking mechanism 26. Finally, the “U” shaped interlocked members 22 and 23 are safely secured by placing pin and cotter keys 28 through the apertures 27 of the members 22 and 23.

The multiple pins 28 and the lower support 24 a at the lower guard rail 413 permits the universal embodiment 21 to be utilized with various cross sections as shown in FIG. 4, above. These features also prevent “tipping” of the tray 34 and, along with the gussets 35, permit the tray 34 to support heavier tools and materials than shown in any prior art embodiments.

Several optional trays and material holders 34,36,38,39,40,41, and 25 were demonstrated in the FIGS. 8, 9 and 10 for the Universal embodiment 21. These are exemplary to what may be provided and should not limit the spirit and scope of this invention.

Alternative Embodiments were also shown. In FIG. 11, material holders for custom built devices 43 and 44 and in FIG. 12 a pinned device 45 would not require the locking device 26 but would be limited as to fixed vertical positions and sizes. In FIGS. 13 and 14, a removable system 46 is depicted to provide a means to interchange the various tray and holding devices shown throughout the drawings 34, 38, 39, 40 and the like. The removable system is simply utilized by aligning the button studs 48 on the angle gussets 47 of the U-interlock member 22 with the key slots 50 of the tray gussets 49. Then one slides the tray down to interlock the buttons 48 in the narrow slot of the key slots 50.

The tool and material shelf/support device as the present invention has been described above in connection with what is presently considered to be the most practical and preferred embodiment. With these descriptions it is to be understood that the tool and material shelf/support device is not to be limited to the disclosed embodiment. On the contrary, the tool and material shelf/support device is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the description. 

1. An universal auxiliary Tool and Material Shelf device for a use on a work platform of mobile aerial lifts, comprising: (a) a top universal “U” shaped interlock member that has an integral material and tool support member and that fits over the highest platform guard rail of the lift; (b) a bottom universal “U” shaped interlock member that fits over the next highest platform guard rail of the lift; (c) one or more vertical telescoping structural support posts fastened to each of the “U” shaped interlock members; and (d) a means for adjustably connecting the telescoping structural support member whereby the device is securely and removably installable to the guard rails of the aerial lift machines without tools.
 2. The device according to claim 1 wherein the integral material and tool support member is comprised of at least one angular structural member that forms a “hook” wherein the member(s) contain the material and tools.
 3. The device according to claim 1 wherein the integral material and tool support member is comprised of a tray wherein the tray contains the material and tools.
 4. The device according to claim 3 wherein the tray is a relatively horizontal, flat surface with short sides around the entire perimeter.
 5. The device according to claim 3 wherein the tray is at a slight incline and has at least one post attached wherein material spools such as those used for electrical wire are laterally held in place by the posts but the spools may be rotated to dispense the wire.
 6. The device according to claim 3 wherein the tray is a relatively horizontal, flat surface with high sides around the entire perimeter that form a deep rectangular container.
 7. The device according to claim 3 wherein the tray is a relatively horizontal, flat surface with medium sides around the entire perimeter and separator panels to create sub-compartments in the tray.
 8. The device according to claim 1 in which the means for adjustably connecting the telescoping structural support member comprises: (a) a hand knob; (b) a threaded shaft connected to the knob; (c) slotted apertures extending through the vertical telescoping structural support posts; (d) an internally threaded tee nut which connects to the threaded shaft on the knob side of the posts and whose tee configuration is moveably engaged to the slotted apertures; and (e) an internally threaded end nut which connects to the threaded shaft on the side of the posts opposite the tee nut wherein the threaded shaft engaged with the tee nut and the end nut provide a clamping force to rigidly secure the telescoping structural support members at a desired position.
 9. The device according to claim 1 in which the means for adjustably connecting the telescoping structural support member comprises: (a) circular apertures extending through the vertical telescoping structural support posts and (b) pins and cotter keys wherein the pins engaged through the posts and are retained by the cotter keys to provide a rigid position to secure the telescoping structural support members at a desired position.
 10. The device according to claim 1 wherein both universal “U” shaped interlock members have a security system which comprises: (a) circular apertures extending through the universal “U” shaped interlock members and (b) pins and cotter keys wherein the pins engaged through the “U” shaped interlock members and are retained by the cotter keys to provide a rigid position to secure the “U” shaped interlock members from tipping or moving under the weight of materials or tools.
 11. An auxiliary Tool and Material Shelf device for a use on a work platform of mobile aerial lifts, comprising: (a) a top “U” shaped interlock member that has a material and tool support member and that fits over the highest platform guard rail of the lift; (b) a bottom “U” shaped interlock member that fits over the next highest platform guard rail of the lift; (c) one or more fixed vertical structural support posts fastened to each of the “U” shaped interlock members that is custom fitted to a specific sized work platform; and (d) a means for securely connecting the structural support member to a customized position whereby the device is removably installable to the guard rails of the specific aerial lift machines without tools.
 12. The device according to claim 11 wherein the material and tool support member is a flat tray, inclined tray with posts for material, a deep tray, a deep tray with dividers for sub-compartment, or one or more material “hooks”.
 13. An auxiliary Tool and Material Shelf device for a use on a work platform of mobile aerial lifts, comprising: (a) a top “U” shaped interlock member that has a removable connection system for the material and tool support member and that fits over the highest platform guard rail of the lift; (b) a bottom “U” shaped interlock member that fits over the next highest platform guard rail of the lift; (c) one or more adjustable vertical structural support posts fastened to each of the “U” shaped interlock members; (d) a means for securely connecting the structural support member to a customized position; and (e) a connection system that permits interchangeability of the various material and tool supports whereby the device is removably installable to the guard rails of the specific aerial lift machines without tools.
 14. The device according to claim 13 wherein the material and tool support member is a flat tray, inclined tray with posts for material, a deep tray, a deep tray with dividers for sub-compartment, or at least one material “hook”.
 15. The device according to claim 13 wherein the connection system comprises: (a) angle gussets with button studs wherein the gussets are rigidly fixed to the top “U” shaped interlock member and (b) gussets with key hole slots on the material and tool support member to removably connect to the button studs wherein the material and tool support members may be interchanged for the needs of the user.
 16. The device according to claim 15 wherein the material and tool support member is a flat tray, inclined tray with posts for material, a deep tray, a deep tray with dividers for sub-compartment, or at least one material “hook”. 